Information processing apparatus and method

Abstract

An information processing apparatus for encoding image data includes: a rearranging unit for rearranging coefficient data divided for each frequency band in order of executing synthesis processing for synthesizing the coefficient data of multiple sub-bands divided into frequency bands to generate image data for each line block including image data equivalent to the number of lines necessary for generating coefficient data equivalent to one line of the sub-band of the lowest frequency components; a control unit for calculating a new quantization step size at the time of encoding the image data for each coding unit using the ratio between the generated code amount at the time of encoding with a known quantization step size and a target code amount at the time of encoding the image data; and an encoding unit for encoding the coefficient data for each coding unit to generate encoded data using the calculated quantization step size.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]The present invention contains subject matter related to Japanese Patent Application JP 2007-020527 filed in the Japanese Patent Office on Jan. 31, 2007, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an information processing apparatus and method, and particularly relates to an information processing apparatus and method, whereby the control of a generated code amount at encoding processing can be performed readily and suitably.[0004]2. Description of the Related Art[0005]Heretofore, with encoding of moving image data, there has been a method for appropriately controlling the assignment of a generated code amount according to the moving image data thereof.[0006]In order to appropriately encode moving image data so as to reduce the deterioration of image quality of the image thereof (such that a decoded image has high image...

AI Technical Summary

Benefits of technology

[0034]The information processing apparatus may further include a correcting unit configured to perform correction to further increase the value of the quantization step size calculated by the calculating unit so as to reduce the code amount generated at the encoding as much as the code amount of the encoded data stored in the buffer is.

[0037]According to embodiments of the present invention, the control of a generated code amount at the encoding processing can be performed. Particularly, control of generated code amount at the encoding processing can be performed readily and suitably.

Problems solved by technology

On the other hand, portions where the quantization step size is small might show image deterioration less than other portions, resulting in the image deterioration of other portions actually being brought to attention.

Images